Crank-shaft-twisting machine



"I Apnl 29, 1930. M. H DAMERELL CRANK SHAFT TWISTING MACHINE Filed Dec. 30, 1926 5 Sheets-Sheet l April 29, 1939.

M. H. DAMERELL CRANK SHAFT TWISITNG MACHINE 5 Sheets-Sheet 2 filed Dec. 30, 1926 .m. E Q

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April 29, 1930- M. H. DAMERELL 1,756,634

CRANK SHAFT TWISTING MACHINE F1 5 Sheets-Sheet 2s led Dec April 29, 1930. M. H. DAMERELL CRANK SHAFT TWISTING MACHINE Filed Dec. 50, 1926 5 Sheets-Swat 4 April 29, 1930. M. H. DAMERELL CRANK SHAFT TWISTING- MACHINE Filed Dec, 50, 1926 5 .SheetsrSheet 5 E471; era 66 y avfihys W hm E Patented Apr. 29, 1930 .MARK H. DAMERELL, OF WORCESTER, MASSACHUSETTS,

GORDON COMPANY, OF \VORGESTER, MASSACHUSETTS, A CORPORATION OF MASSA-' GHUSETTS ASSIGNOR T WYMAN- CRANK-SHAFT-TWISTIIJG MACHINE Application filed December 30, 1928.

This invention relates to machines for twisting crankshafts. It is the common practioe to manufacture such crankshafts, particularly six-throw shafts, by forging the shaft flat and thereafter twisting the shaft to position the cranks in the desired angular relation.

Machines for this general purpose have been heretofore designed by me and it is the general object of my present invention to improve and simplify the construction of my earlier machines, producing a machine which is less expensive to build, more rapid in operation, and equally eiiicient in use.

A. further object is to provide a machine in which the twisting of the cranks is produced by the indirect action of the movable press member and in which a final setting pressure is applied by direct action of said movable member.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings in which Fig. 1 is a front elevation of my improved machine, with portions of the supporting frame omitted 2 is an end elevation, looking in the direction of the arrow 2 in Fig. 1;

Fig. 3 is a sectional end elevation, showing the relation of certain parts as taken along line 33 in Fig. 1;

Fig. 4 is a view similar to Fig. 3 but showing the parts in a different position;

Fig. is a sectional end elevation, showing relation ofcertain parts as taken along the line 55 in Fig. 1.

Figs. 6 and 7 are views similar to Fig. 5 but showing successive operative positions thereof;

Fig. 8 is a detail plan View, looking in the direction of the arrow 8 in Fig. 5;

Fig. is a sectional elevation, taken along Serial No. 158,099.

the line 99 in Fig. 8, certain parts being shown in solid lines;

Fig. 10 a rear elevation, looking in the direction of the arrow 10 in Fig. 8';

Fig. 11 is a sectional front elevation, taken along the line 11 11 in Fig. 5;

Fig. 12 is a sectional end elevation, taken along the line 1212 in Fig. 11;

Fig. 13 is a plan view, partly in section, of one of the clamping mechanisms, taken along the line 1313 in Fig. 3;

Fig. let is a detail rear elevation, looking in the direction of the arrow 14 in Fig. 5; and

Fig. 15 is a sectional rear elevation, taken along the line 1515 in Fig. 2.

Referring particularly to Figs. 1 and 2, my improved crankshaft twisting machines comprises a base or anvil 2O suitably supported on a bed 21 and firmly secured in position thereon. A movable member or head 22 is mounted above the base and is supported for vertical straight line movement, the supporting mechanism being not shown herein. The head 22 may be the moving element of any ordinary gear driven or hydraulic press or n ay be otherwise given a slow powerful operative movement.

The crankshaft S is placed in the machine with all of its cranks formed in a single plane and with the No. 2 and No. 5 cranks projecting downward between pairs of clamping dies 24, as indicated in Figs. 3 and 4c. The dies 24 are mounted in sliding carriers 25 and may be accurately positioned therein by inserting shims 26 between the dies and the carriers. The dies are secured to the carriers in any convenient manner. Rolls 27 are mounted in slots 28 in the carriers 25 (see Fig. 13) and additional rolls 29 are mounted in blocks 30 rigidly secured in the base 20. Cam bars 31 are secured to the head 22 and are provided with tapered lower ends extending the rolls 27 and 29.

As the head 22 descends, the carriers 25 are forced inwardly as indicated in Fig. 4, thus between V gripping the crankshaft S firmly between the neously and the No. 2 and N o. cranks are thus firmly gripped before the twisting operation begins.

Three set of twisting mechanism are provided, one at the front central part of the machine for twisting the No. 3 and No. 4

cranks rearwardly and one at the rear at each end of the machine for twisting the No. 1 and No.6 cranks forwardly. These three twisting mechanisms are substantially identical in construction and operation and a description of the twisting mechanism shown in Figs. 5 to Tfor twisting the No. 6 crank forwardly will apply equally to the other two twisting mechanisms.

Referring to Figs. 5 to 7, the twisting mechanism therein shown comprises a movable die 40 having a trunnionbearingin a swinging arm 41 pivoted at 42 to a supporting plate 43 bolted to the head 22. The movable die 40 is thus supported for angular or rotational movement in the end of the arm 41 and the die is also supported for sliding movement on a fixed guide block 45. The die 40 rests freely upon the guide block 45, being guided for straight line movement thereon by V-shaped ways 46 (Figs. 6. and 11) but being free to lift upwardly therefrom as will be hereinafter described. The trunnion bearings of the die 40 in thearms 41 prevent displacement of the die, while permitting free angular or rotational movement thereof.

"The die 40 is also connected by a link 50 (F 5) to a bell-crank 51, pivoted at 52 on the en 3 )ortin :late 43 and havin its rear- 1 l g l 2:

arm connected by a link 54to the rear arm 55 of'the swinging arm or support 41. The link 54 is constructed to permit limited lost motion and the details thereof are best shown in Fig. 14. I p

The link 54 comprises a T-shaped member 54 pivoted between the arms 55 of the swinging supports 41' and having a stud 57 adjustably threaded in the upper end thereof. The stud 57 extends through a transverse opening 58 in a cross member 59 pivoted between the rearwardly extending arms 53 of the. bellcranks 51. The stud 57 is so adjusted in the link 54 as to permit a limited lost motion between the points of engagement of the link 54 and of the head of the stud 57 with the cross member 59.

The upper rear portion of the movable die 40 is bevelled at its edges as indicated at 60 and 61 (Fig. 5) and the supporting plate 43 is provided with a similarly bevelled opening 62 adapted to receive the bevelled portion of the movable die 40, as the die reaches its final operative position.

The die 40 is recessed at 64 (Fig. 5) to receive the No. 6 crankpin and is also recessed at 65 to receive a pivot member 66 (Fig. 9) having a laterally extending portion 67 mm ly seated in a fixed die block 68. An opening (39 through the die block is provided, so that the pivot member 66 may be driven out of the die block for replacement or repair. The block 68 is also provided with a recess 70 (Fig. 8) to receive the No. 6 crankpin and with recesses 71 to receive the cheeks or arms whi 11 support the crankpin. Corresponding recessesfor the opposite sides ofthe cheeks provide-din the movable die 40. The twisting mechanism for the No. 1 crank is identical with that just described for the No. crankaiid the mechanism for twisting the No. 3 and No. 4cranks is also identical in construction, with the exception that it is of double width as-shown in Fig. 15 to receive both cranks l lo. 3 and No. 4.

Having described. the construction. of my improved twisting machine, I will now de-- s-ibe' the operation there'of. The initial p0- si n of the twisting mechanism 18 as shown in 131%. 5, which corresponds to the position of the clamping mechanism shown in Fig. 3. As the head 22 descends, the clamping mechanism grips the No. 2 andNo. 5 cranks as previously described, and the the blocks. 40

slide downward along the guide blocks 45 from the position shown in Fig. 5 to that shown in 6. V I

During this initial movement there is no angular movement of the dies 40, the parts remaining in their initial relation due to the lost motion construction of the link 54 previously described. In the position shown in Fig. 5, the link 54 is at its extreme upward aosition whereas in Fi 6 it has takenup 7 L. 5 r i the lost motion and reached its opposite limit of movement relative to the cross member 59 As the head 22 continues to descend, the recess 65 5) in each movable die 40 its pivot member 66 (Fig. 9), and any further sliding movement of each die 40 is thus prevented. The pivots 42 and 52 of the supports 41 and bell-cranks 51 continue to move downward, causing a clock-wise angular movement of the support 41 about its pivot 42 and a corresponding clock-wisemovement of the bell-crank 51.

Such movement of the bell-cranks 51, acting through the links 50, causes anti-clockwise movement of the die 40 in the supporting arms 41. While the die 40 is thus moving in its trunnion bearing in its'arms 41, it must also swing about the center of the pivot block 66 with which it is in contact. thus moved from the position shown in Fig. 6 to that shown in Fig. 7, just before the final downward movement of the head 22. Such final movement causes the bevelled upper part The die 40 isof the die to be received in the recess 62 of the supporting plate 43 and the die thus receives a direct downward pressure from the head 22, forcing the die to the exact desired final position.

During the described movement'of the die 40 and the No. 6 crankpin, it will be under stood that exactly similar movements of crankpins No. 1, No. 3 and No. 4 have been produced, thus twisting the entire crankshaft to the desired final form. As the head 22 thereafter moves upward, the described movements of the die block are reversed, returning the parts to the position shown in Fig. 5.

I have thus provided a very simple twisting machine having comparatively few operating parts, which parts may be easily adapted to different sizes and shapes of crankshafts. All of the operations are obtained by a simple straight line movement of the head 22, and the crankshaft is not only twisted but is subjected to a heavy and accurately applied final setting pressure.

While I have described a form of my invention in which the dies are vertically disposed and in which the upper dies only are movable, my invention is not limited to such an ar rangement of parts and may be modified as conditions arise. It is'equally good and common practice to move the lower dies toward and from the upper die head producing the same relative motion of the dies and the whole machine may be turned on its side and operated horizontally or in an inclined direction instead of vertically, if so desired.

As stated above after the crank shaft is forged or otherwise formed, the cranks are pos tioned thereon by twisting, and it is intended that the term twisting as used in the specification shall be construed as a movement of the crank portions or other projecting portions of the shaft angularly of the shaft axis, relative to other similar portions on the shaft.

Having described my invention and the advantages thereof, I do not wish to be lim ited to the details herein disclosed otherwise than as set forth in the claims, but what I claim is:-

1. A crankshaft twisting machine having, in combination a bed, a head vertically reciprocable wit-h respect thereto, a fixed die, a movable die, means actuated by said head to slide said movable die on said bed into and out of engagement with an offset portion of a crankshaft, and means to rock said movable die to move said portion and thereby twist said crankshaft.

2. A crankshaft twisting machine having, in combination, a bed, a head vertically reciprocable with respect thereto. a fixed die, a movable die, means actuated by said head to slide said movable die in an inclined path on the bed into engagement with an offset portion of a crankshaft, and means to rock said movable die to move said portion and movable die, means actuated by said head to slide said movable die in an inclined path along fixed guideways on the bed into engagement with an offset portion of a crankshaft, and means to rock said movable die to move said portion and thereby twist said crankshaft.

l. A crankshaft twisting machine having, in combination, a bed, a head vertically reciprocable with respect thereto, a fixed die, a movable die, means actuated by said head to slide said movable die in an inclined path along fixed guideways on the bed into engagement with an off-set portion of a crankshaft, and means to rock said movable die to move said portion and thereby twist said crankshaft, said die being free to lift from said guideways while slidable thereon.

5. A crankshaft twisting machine having, in combination, a bed, a fixed die, a movable die, means to slide said movable die on said 7 bed, into and out of engagement with an onset portion of the crankshaft, means to rock said movable die relative to said fixed die thereby to move said portion and thereby twist said crankshaft, and a single movable 7 member effective to'advance said movable die to operative posit-ion and to thereafter rock said movable die.

6. A crankshaft twisting machine having, in combination, a bed, shaft clamping devices, a fixed die, a movable die, means to slide said movable die on said bed, into and out of engagement with an offset portion of the crankshaft, means to rock said movable die relative 7 member associated therewith, a movable die,

means to advance said movable die to operative position adjacent said pivot, and means to move said die relative to said fixed die and angularly about said pivot membert-o engage and twist the shaft.

8. A crankshaft twisting machine having, in combination, a fixed die, a fixed pivot member associated therewith, a movable die, means to advance said movable die to operative position in engagement with said pivot member, and means to move said die relative to said fixed die and angularly about said pivot member to twist the shaft.

9. A crankshaft twisting machine having, in combination, a fixed die, a fixed pivot member associated therewith, a movable die,

to said fixed die thereby to move said portion 7 means to advance said movable die by a substantially straight line movement to engage said pivot member, and means to move said die relative to said fixed'die and angularly about said pivot member to twist the shaft.

10. In a crankshaft twisting machine,: a

base, a die mounted on said base, a movable d1e,1ncl1ned guide-ways on said base for sald movable die, means to slide said movable die on said guide-ways, and means to rock said a movable die relative to said fixed die and to engage and twist a crankshaft after sliding movement of said die to operative position.

11. A crankshaft twisting machine having, in combination, a fixed die, a movable die, means to give said movable'die a substantial- 5 lystraight line movement to twisting position,,means to rock said movable die and twist a crankshaft, and means to apply a direct final setting pressure to said movable die after such twisting movement. V

12. A crankshaft twisting machine havlng,

in combination, a fixed die, a movable die,

means to give said movable die a substantial- 1y straight line movement to twisting position, means to rock said movable die and twist a crankshaft, and means to give said movable die an exact predetermined final angular position and to apply a direct final setting pressure thereto. 7

13. AL crankshaft twisting machine having, in combination, a fixed die, a movable die, a movable head, supporting arms pivoted on said head and having trunnion bearings for said movable die, and a lever mounted on said head and linked to said movable die and to said supporting arms, whereby said die is rocked as said head moves toward said fixed die.

port a crank shaft, a head movable in a vertical path respective to said bed, a movable die adapted to engage said crank shaft, means connecting'said die and said head, thereby to indirectly actuate said die, upon movement of the head, and slide said die along the bed,

into engagement with said shaft to thereafter twist the shaft, and means in said head thereafter to directly actuate said die, whereby to set the shaft in twisted form.

16; A crank shaft'twisting machine, having in combination, a bed, means thereon, to support a crank shaft, a head movable in a vertical path respective to said bed, a movable to said bed, a movabledie adapted to engage V said crank shaft, means connecting said die and said head whereby to indirectly actuate said die upon movement of the head, thereby to twist said shafts and a'recess in said head shaped to fit and engage said die thereafter to directly actuate said die, thereby to set said shaft. V

18. A crank shaft twisting machine, having in combination a bed,'means thereon to support a crank shaft, a headfmovable in a vertical path respective to said bed, a movable die adapted to engage said crank shaft, links pivoted to said head and connected to said die, other links pivoted to said head and connected to said die, lost motion connections between said firstlink and said latter links, thereby to indirectly actuate said die upon movement of the head, and a recess in said head shaped to fit and engage said die thereafter to directly actuate said head.

19. In a press for positioning the throws of a multi-throwcrankshaft, a set of holding devices, and a set of twisting devices for the several throws of the crankshaft, a movable member, and means operated by the movement of said member in one direction to first place the holding devices and the twisting devices in engagement with the crank throws,

and to then rotate'the twisting devices rela i tive to the holding devices and in opposite d1rect1ons,wh1le said holdlng devices grlp .the shaft. r

7 21. In a press for positioning the throws of a inulti-throw crankshaft, a die block, a

set of holding dies, anda set of twisting diesv for the several throwsof the crankshaft, one

part of each die beingin'ounted on said die block, a reciprocating member, and means actuated by the movement of the member toward the die block effective to bring'the holding and twisting dies into operative engagement with the throws 0f the crankshaft and thereafter effective to cause predetermined angular movements of the twisting dies relative to the holding dies and in opposite directions, and while the shaft is gripped by the holding devices.

In testimony whereof I have hereunto affixed my signature.

MARK H. DAMERELL. 

